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Component level xBuddy repair: diode D37, "150"  

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bruhnstv
(@bruhnstv)
Member
Component level xBuddy repair: diode D37, "150"

On the off chance someone else does component level repairs:  My xBuddy board FDM-MK4-xBuddy blew F1, which feeds power to the extruder nozzle. With F1 removed, there showed a dead short from the output end of that fuse holder to ground/common.  This persisted with the output disconnected.  There doesn't appear to be a schematic available online.  I figured the problem would be a shorted part, most likely a diode or capacitor.  Could see D37 connected apparently as a "catch" diode directly to the output terminal of F1.  Pulled up one end of F1, and sure enough, it's shorted.  It appears to be a Diodes Inc part, labeled simply "150".  So far, I haven't found a Diodes Inc part whose data sheet claims that as a marking:  I do find B150 called out for Schottky 1A, 50V SMA-size.  If nobody can help with a better match, I'll just try the B150, or perhaps the 3-A rated B350 which might be a bit more robust in this application.  Comments welcome, of course.

Posted : 29/10/2025 6:17 pm
miroslav.h4
(@miroslav-h4)
Honorable Member
RE: Component level xBuddy repair: diode D37, "150"

You can find the X-Buddy schematic here:

https://www.prusa3d.com/downloads/Electronics_drawings/FDM-xBUDDY-44.pdf

Strangely enough, it's on the Prusa website, but who would look for it there, right?

Posted : 30/10/2025 10:30 am
miroslav.h4
(@miroslav-h4)
Honorable Member
RE: Component level xBuddy repair: diode D37, "150"

The diode in question is an ESD protection diode of the type SMAJ28A-13-F. Find the rest yourself.

Posted : 30/10/2025 10:50 am
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